For the artificial weathering studies, pine panels (pinus
radiata) (200 9 90 9 10 mm) with back and end grain
sealing with a 2K PUR clearcoat were used. The lignin
stabilizer pretreatment was performed with a 1%
aqueous solution applied by brush (1 9 80 g/m2). The
paint used is a commercially available, clear WB acrylic
joinery coating system (40% solids—containing 0.5%
active of a nonbasicHALS used as a NEAT product) on
total applied by brush (2 9 120 g/m2). UVA are tested
in concentrations of 0.25, 0.5, 1.0, and 2.0% active on
total formulation as described in Table 1. The chemical
structures of the organicUVA are seen in Fig. 1. Before
use, the delivery form of all additive dispersions is stirred
and incorporated via high-speed dissolver to achieve
homogeneous distribution as recommended in the
technical data sheets provided by the supplier.
For the artificial weathering studies, pine panels (pinusradiata) (200 9 90 9 10 mm) with back and end grainsealing with a 2K PUR clearcoat were used. The ligninstabilizer pretreatment was performed with a 1%aqueous solution applied by brush (1 9 80 g/m2). Thepaint used is a commercially available, clear WB acrylicjoinery coating system (40% solids—containing 0.5%active of a nonbasicHALS used as a NEAT product) ontotal applied by brush (2 9 120 g/m2). UVA are testedin concentrations of 0.25, 0.5, 1.0, and 2.0% active ontotal formulation as described in Table 1. The chemicalstructures of the organicUVA are seen in Fig. 1. Beforeuse, the delivery form of all additive dispersions is stirredand incorporated via high-speed dissolver to achievehomogeneous distribution as recommended in thetechnical data sheets provided by the supplier.
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